Senior Employee Relations Manager
This is a Permanent, Full Time vacancy that will close in {x} days at {xx:xx} BST.
The Vacancy
We’re looking for an experienced Employee Relations Manager to lead our ER function and provide expert, commercially grounded advice across complex employee matters and organisational change.
Reporting to the People Director, you’ll take ownership of all complex ER activity, act as the organisation’s TUPE subject matter expert, and lead our HR Advisory team to deliver a consistent, high‑quality and risk‑managed ER service. This is a senior, influential role working closely with leaders across the business.
What you’ll be doing
Leading complex employee relations
- Owning and overseeing complex ER cases, including disciplinaries, grievances, performance, absence, investigations and disputes
- Ensuring outcomes are consistent, fair and legally robust
TUPE and organisational change
- Acting as the end‑to‑end TUPE lead on inbound and outbound transfers
- Managing due diligence, information and consultation, employee transitions and documentation
- Partnering with senior stakeholders on restructures, redundancies and change programmes, providing expert advice on consultation frameworks and people impacts
Union and employee representative engagement
- Building strong, constructive relationships with recognised trade unions and employee forums
- Supporting and leading collective consultation and representing the People team in formal meetings where required
Leading and developing the ER team
- Managing and developing the HR Advisors, embedding high standards of case management and decision‑making
- Driving coaching, quality assurance and continuous improvement across the team
Policy, governance and risk
- Owning ER policies and procedures, ensuring they remain up to date, relevant and legally compliant
- Maintaining clear ER governance and risk frameworks and advising the business on employment law obligations
What we’re looking for
Experience and expertise
- Extensive experience managing complex ER casework in a medium or large organisation
- Proven end‑to‑end TUPE experience
- Experience working with trade unions or employee representative bodies
- Strong track record supporting restructures, consultations and organisational change
- Experience managing or mentoring HR Advisors or ER specialists
Knowledge and qualifications
- Strong, up‑to‑date knowledge of UK employment legislation and case law
- Deep understanding of TUPE and consultation requirements
- CIPD Level 5 essential (Level 7 desirable)
Skills and personal qualities
- Confident, calm and credible with senior stakeholders
- Excellent judgment, resilience and integrity
- Strong investigation, report writing and problem‑solving skills
- Collaborative, coaching‑led leadership style with a proactive, solutions‑focused approach
Why join us?
- Non-contractual 10% annual bonus based on company and personal performance of your annual salary.
- 25 days annual leave, increasing to 30 days with yearly service + 8 bank holidays + day off on your birthday.
- Company sick pay – 6 months and then SSP.
- Enhanced maternity & paternity pay.
- Life assurance x4 of your basic salary.
- Pension plan – Calisen will double your personal contribution into the scheme up to a maximum of 7% of your gross salary.
- Private Medical Insurance
- Access to a 24/7 Employee Assistance Plan Helpline.
- My Rewards Platform: Discounts from hundreds of top retailers, just for being part of the team.
- Electric Vehicle Salary Sacrifice Scheme
This is a pivotal role within our People function, offering the opportunity to shape how employee relations is delivered across the organisation. You’ll work closely with senior leaders, influence major change activity, and lead a skilled advisory team in a complex and fast‑moving environment.
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The Company
Calisen plays a leading role in managing essential energy infrastructure that supports a smarter, more sustainable future for everyone. Through smart metering, installation, data services and solar, we’re helping homes and businesses move towards cleaner, more efficient energy.
Whatever your background or experience, your Calisen career could be just around the corner. Research shows some groups of people may hesitate to apply unless they meet every single requirement. If you’re excited about a role, we encourage you to apply, even if you don’t tick every box. You might be exactly who we’re looking for! Our people are our greatest strength. Calisen is an equal opportunities employer: We value honesty, empathy and collaboration, and we believe that different perspectives and experiences help us succeed. Our commitment is to fairness, inclusion and creating an environment where everyone can thrive.
We use some artificial intelligence (AI) tools to support parts of our recruitment process. These tools are designed to assist our Talent team, not replace them. Every decision is reviewed and made by our people. If you’d like to know more about how your data is used, please get in touch with us at any time.
The Values
We are one team
When we all work together, amazing things can happen. We are all committed to open dialogue and collaboration. We break down barriers to teamwork and avoid silos.
We care
We are inclusive - we respect each other and believe everyone matters. We set high standards for our work and lead by example. We make a positive difference to our colleagues, customers and communities.
* The holiday amount changes dependent on the business area
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